| 122 / | HD | LIQUID HEATERS AND VAPORIZERS |
| 459 | DF | STEAM TREATMENT {7} |
| * | | .~ Water tube boiler {7} |
| * | DD | .~.~> Declined over bridge wall {1} |
| * | DD | .~.~> Longitudinal drum {1} |
| * | DD | .~.~> Over bridge wall {1} |
| * | DD | .~.~> Standpipe {1} |
| * | DD | .~.~> Transverse drum {1} |
| 477 | DF | .~.~> Superheater and feed heater |
| 476 | DF | .~.~> Superheater |